The relationship of ejection time to heart rate was examined in 19 ath-letes, 21 sedentary normal subjects and 19 patients with anginal ischemic heart disease.
Exercise tests were performed using the step test, the bicycle ergometer and the treadmill. Regression analysis was applied to the data by regressing ET on HR and delta ET on delta HR.
No significant differences were demonstrated between these groups even though the coronary insufficient patients manifested ischemic S-T segment changes and angina. Slight differences existed between the normal and is-chemic groups when the delta ET-delta HR relationship was examined, but the variance of the data challenged the significance.
The data indicated that at any level of heart rate induced by exercise, the measurement of ejection time will not distinguish between trained athletes, normal sedentary subjects or coronary insufficient patients.